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(No Model.)

J. M. FAIRFIELD 81; G. I. FRANCIS.

TYPE WRITING MACHINE'.

Patented Deo. 15,1891.

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miams llamas no., maro-Limo., wmumcrmn u c NITED STATES PATENT OFFICE.

.IOIIN M. FAIRFIELD AND GRAHAM I. FRANCIS, OF HARTFORD, CONNECTICUT, ASSIGNORS TO THE AMERICAN VRITING MACHINE COMPANY, OF SAME PLACE.

TYPE-WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 465,042, dated December 15, 1891.

Application filed July 17, 1889. Serial No. 317,833. (No model.)

I known to those skilled in the art, forordinary work a comparatively soft platen yields the best results, while for manifoldin g or the taking of a large number ofcopies at one time a platen with a harder surface should be cmployed to obtain the 1n ost satisfactory impressions. It is desirable therefore to provide a construction of machine by which the operator may with facility make the change from one type of platen to the other, according to the character of the work to be performed.

To this end our invention consists in the features of construction and combinations ofA devices hereinafter more fully described, and

particularly pointed out in the appended claims.

In the accompanying drawings, Figure l is a top view of a type-writing-machine papercarriage embracing our invention. Fig. 2 is central vertical section of the same. Fig. 3 is a vertical section taken at the line Qc x, Fig. 1; and Figlis a horizontal section taken at the line y y of Fig. 3. j In the several views the sam-e part will be found designated by the same numeral of reference. y

The carriage-frame consists of a front rod 2, a rear rod 3, and end bars 4 and 5. The end bar 4: is shown as made integral with the front and rear rods; but this is no part of our joint invention. The free ends of the front and rearrods are flattened on opposite sides, as seen at 6, and are threaded axially. The end bar 5 is grooved, as at 7, to receive the flattened ends of the rods 2 and 8, and is perforated at 8 S for the passage of screws 9 9, which take 'into the threaded holes in said rods.

' 1() designates a cylindrical platen consisting, preferably, of a hollow wooden core 1l,

a surrounding sheath of rubber 12, and cir-' 55 cular heads or end pieces 13 and 14, having perforated hubs 15. The heads are attached to the core preferably by screws 16.

Secured to the end bar a is an inwardlyprojecting socket-piece 17, threaded interior- 6o ly, as seen at 1S, for the accommodation of a screw 19, provided at its forward end with a conical journal 20, a circular` fiange 2l, and a capstairhole 22. The socket-piece is also threaded exteriorly, as seen at 23, and is provided with a threaded n ut 24.

Fast in the end bar 5 is a conical journal 25, in line with that marked 20, and projecting inwardly. 2G designates a rod preferably supported loosely in the platen-heads and pro- 7o vided at each end wit-h a conical bearing 27 for the reception of the journals 20 and 25.

In order to remove the platen from its frame, the nut 2a is screwed toward the end bar 4, and the screw 19'is turned farther into the 75 socket-piece until the journal 20 is fully out of its seat 27. The platen may then be detached. To insert another one, first engage the journal 25 with its proper bearing 27, Y then bring the opposite bearing in line with So the journal 20, then turn the screw until said journal enters its seat, and then screw up the nut against the flange 2l to prevent any accidental recession of the screw 19 and the journal thereon.

The capstan-hole is provided to enable the screw 19 to be turned by a pin or wire. Instead ot' this, a square portion may be provided to adapt the device for a small wrench.

At the right-hand end of the carriage-frame 9o is illustrated the line-space mechanism, consisting of a ratchet-wheel, push-pawl, lever, and spring-controlled-platen check; but this group of devices forms no part of our present invention.

that we claim as new, and desire to obtain by Letters Patent, is-

1. In a type-writing machine, the combination, in a paper-carriage, of an end bar provided with a fixed inwardly-projecting socket- 10o piece threaded interiorly, a cylindrical platen having a journal-bearing at each end, ascrew mounted in said inwardly-projecting threaded socket-piece and adapted to loe moved to and from said cylindrical platen and provided with a journal at its inner end for one end of said platen, and an end bar provided with a journal for the opposite end of the platen, as and for the purpose set forth.

2. In a type-Writing machine, the combination, in a paper-carriage, of a cylindrical platen, a platen-axle extending through the platen and having a journal-hearing at each end, an end bar having a journal engaging with the bearing in one end of the platenaxle, an end bar provided with a xed inwardly-proj ectin g socket-piece threaded in teriorly, and a screw mounted in said inwardlyprojecting threaded socket-piece and adapted to be moved to and from said cylindrical platen and provided With a journal at its inner end for the opposite end of the platenaxle, as and for the purpose set forth.

f3. In a type-writing machine, the'combination, at one end of a paper-carriage having a cylindrical revoluble platen, of a journalbearing, a journal, a screw, a threaded socketpiece or screw-support, a flange on the screw, and a binding-nut on the socket piece or support, substantially as set forth.

Signed at Hartford, in the county of Hartford and State of Connecticut, this' 6th day of July, A. D. 1889.

JOHN M. FAIRFIELD. GRAHAM I. FRANCIS.

Witnesses:

, CHARLES A. SAFFORD, THOMAS B. CHAPMAN. 

